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module Main where
import Control.Concurrent
import Control.Concurrent.STM
import Control.Monad
import Data.List
import Data.Maybe
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Text.Regex.TDFA
import Text.Regex.TDFA.String
import System.Directory
import System.Environment
import System.Exit
import System.FilePath
import System.IO
import System.IO.Error
import System.Process
import Parser
import Test
data Network = Network
{ netNodes :: MVar [Node]
, netDir :: FilePath
}
data Node = Node
{ nodeName :: NodeName
, nodeNetwork :: Network
, nodeProcesses :: MVar [Process]
, nodeDir :: FilePath
}
data Process = Process
{ procName :: ProcName
, procHandle :: ProcessHandle
, procNode :: Node
, procStdin :: Handle
, procOutput :: TVar [String]
}
testDir :: FilePath
testDir = "./.test"
initNetwork :: IO Network
initNetwork = do
exists <- doesPathExist testDir
when exists $ ioError $ userError $ testDir ++ " exists"
createDirectoryIfMissing True testDir
callCommand "ip link add name br0 type bridge"
callCommand "ip addr add 192.168.0.1/24 broadcast 192.168.0.255 dev br0"
callCommand "ip link set dev br0 up"
callCommand "ip link set dev lo up"
Network <$> newMVar [] <*> pure testDir
exitNetwork :: Network -> IO ()
exitNetwork net = do
nodes <- readMVar (netNodes net)
ok <- fmap and $ forM nodes $ \node -> do
processes <- readMVar (nodeProcesses node)
fmap and $ forM processes $ \p -> do
hClose (procStdin p)
waitForProcess (procHandle p) >>= \case
ExitSuccess -> return True
ExitFailure code -> do
putStrLn $ "\ESC[31m" ++ unpackNodeName (nodeName node) ++ "!!> exit code: " ++ show code ++ "\ESC[0m"
return False
if ok
then do removeDirectoryRecursive $ netDir net
exitSuccess
else exitFailure
getNode :: Network -> NodeName -> IO Node
getNode net nname@(NodeName tnname) = (find ((nname==).nodeName) <$> readMVar (netNodes net)) >>= \case
Just node -> return node
_ -> do
processes <- newMVar []
let name = T.unpack tnname
dir = netDir net </> ("erebos_" ++ name)
node = Node { nodeName = nname
, nodeNetwork = net
, nodeProcesses = processes
, nodeDir = dir
}
exists <- doesPathExist dir
when exists $ ioError $ userError $ dir ++ " exists"
createDirectoryIfMissing True dir
modifyMVar_ (netNodes net) $ \nodes -> do
callCommand $ "ip netns add \""++ name ++ "\""
callCommand $ "ip link add \"veth_" ++ name ++ ".0\" type veth peer name \"veth_" ++ name ++ ".1\" netns \"" ++ name ++ "\""
callCommand $ "ip link set dev \"veth_" ++ name ++ ".0\" master br0 up"
callOn node $ "ip addr add 192.168.0." ++ show (11 + length nodes) ++ "/24 broadcast 192.168.0.255 dev \"veth_" ++ name ++ ".1\""
callOn node $ "ip link set dev \"veth_" ++ name++ ".1\" up"
callOn node $ "ip link set dev lo up"
return $ node : nodes
return node
callOn :: Node -> String -> IO ()
callOn node cmd = callCommand $ "ip netns exec \"" ++ unpackNodeName (nodeName node) ++ "\" " ++ cmd
spawnOn :: Node -> ProcName -> String -> IO Process
spawnOn node pname cmd = do
(Just hin, Just hout, Just herr, handle) <- createProcess (shell $ "ip netns exec \"" ++ unpackNodeName (nodeName node) ++ "\" " ++ cmd)
{ std_in = CreatePipe, std_out = CreatePipe, std_err = CreatePipe
, env = Just [("EREBOS_DIR", nodeDir node)]
}
out <- newTVarIO []
let readingLoop :: Handle -> (String -> IO ()) -> IO ()
readingLoop h act =
tryIOError (hGetLine h) >>= \case
Left err
| isEOFError err -> return ()
| otherwise -> putStrLn $ "\ESC[31m" ++ unpackNodeName (nodeName node) ++ "!!> IO error: " ++ show err ++ "\ESC[0m"
Right line -> do
act line
readingLoop h act
void $ forkIO $ readingLoop hout $ \line -> do
putStrLn $ unpackNodeName (nodeName node) ++ "> " ++ line
atomically $ modifyTVar out (++[line])
void $ forkIO $ readingLoop herr $ \line -> do
putStrLn $ "\ESC[31m" ++ unpackNodeName (nodeName node) ++ "!> " ++ line ++ "\ESC[0m"
let process = Process
{ procName = pname
, procHandle = handle
, procNode = node
, procStdin = hin
, procOutput = out
}
modifyMVar_ (nodeProcesses node) $ return . (process:)
return process
getProcess :: Network -> ProcName -> IO Process
getProcess net pname = do
nodes <- readMVar (netNodes net)
(p:_) <- fmap catMaybes $ forM nodes $ \node -> do
processes <- readMVar (nodeProcesses node)
return $ find ((pname==).procName) processes
return p
tryMatch :: Regex -> [String] -> Maybe (String, [String])
tryMatch re (x:xs) | Right (Just _) <- regexec re x = Just (x, xs)
| otherwise = fmap (x:) <$> tryMatch re xs
tryMatch _ [] = Nothing
expect :: Process -> Regex -> IO ()
expect p re = do
mbmatch <- atomically $ do
out <- readTVar (procOutput p)
case tryMatch re out of
Nothing -> retry
Just (m, out') -> do
writeTVar (procOutput p) out'
return $ Just m
case mbmatch of
Just line -> putStrLn $ "\ESC[32m" ++ unpackNodeName (nodeName (procNode p)) ++ "+> " ++ line ++ "\ESC[0m"
Nothing -> putStrLn $ "\ESC[31m" ++ unpackNodeName (nodeName (procNode p)) ++ "/> expect failed" ++ "\ESC[0m"
send :: Process -> Text -> IO ()
send p line = do
T.hPutStrLn (procStdin p) line
hFlush (procStdin p)
runTest :: String -> Test -> IO ()
runTest tool test = do
net <- initNetwork
forM_ (testSteps test) $ \case
Spawn pname nname -> do
node <- getNode net nname
void $ spawnOn node pname tool
Send pname line -> do
p <- getProcess net pname
send p line
Expect pname regex -> do
p <- getProcess net pname
expect p regex
Wait -> do
putStr "Waiting..."
hFlush stdout
void $ getLine
exitNetwork net
main :: IO ()
main = do
tool <- getEnv "EREBOS_TEST_TOOL"
files <- getArgs
forM_ files $ mapM_ (runTest tool) <=< parseTestFile
|